> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 3v3 Sustain for Raspberry Pi

**Type:** Product page · **SKU:** CE08446 · **Brand:** [The Pi Hut](https://core-electronics.com.au/brands/the-pi-hut)
**Page:** https://core-electronics.com.au/3v3-sustain-for-raspberry-pi.html ([markdown](https://core-electronics.com.au/3v3-sustain-for-raspberry-pi.html.md))

When rebooting a Raspberry Pi 4, the 3.3V rail is reset which causes problems for some HATs and projects. The 3v3 Sustain solves this problem! The board...

## Pricing

- **Price:** $8.60 (inc GST) — $7.82 AUD, exc GST
- **Quantity discounts:** 10+ $7.51 (exc GST) · 25+ $7.27 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 28 and Aug 31.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=CE08446:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/CE08446:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

When rebooting a Raspberry Pi 4, the 3.3V rail is reset which causes problems for some HATs and projects.

The 3v3 Sustain solves this problem! The board fits in between a Raspberry Pi and a HAT/pHAT and provides a stable 3.3V (300mA max) during reboots.

It also has a cutout to help keep the Pi 4 cooler (can be used with the [Pimoroni Fan Shim](https://core-electronics.com.au/fan-shim-for-raspberry-pi) or similar).

**Example use**

One of the features added to the [Cluster HAT v2.x](https://core-electronics.com.au/cluster-hat-v2-0) was to allow the controller Pi to reboot without powering off the Pi Zeros. With the Raspberry Pi 4, this no longer works as once the 3.3V rail is reset, the I/O expander loses power and powers off the Pi Zeros.

**Contents**

- Pre-soldered 3v3 Sustain PCB
- 4x 12mm M2.5 spacers
- 8x 6mm M2.5 screws
 
**Note**: Raspberry Pi 4, ClusterHAT and Fan Shim not included

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/i/m/image_13276.jpg)